Circle-spacing device



H. R. HEYMAN.

CIRCLE SPACING DEVICE.

APPLICATION FILED JUNE 30,1919.

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CIRCLE SPACING DEVICE. APPLICATION FILED JUNE 30, 1919.

1,344,587. Patented June 22, 1920.

2 SHEETS-SHEET 2.

avwentoz Harry R. Heym an.

A4 QSMA Q UNITED STATES PATENT OFFICE.

HARRY R. HEYIVIAN', 0F BERKELEY, CALIFORNIA.

CIRCLE-SPACING DEVICE.

' Application filed June 30 To all whom it may concern.

Be it known that I, HARRY R. HEYMAN, a citizen of the United States, residing at Berkeley, in the county of Alameda and State of California, have invented certam new and useful Improvements in Circle- Spacing Devices, of which the following is a specification. I

My invention is a device for dividing circles, particularly useful in spacing the bolt holes in tank heads.

In this specification and the annexed drawings, I disclose my invention in the form which I consider the best, but I do not limit my invention to such form because 1t may be embodied in other forms, and it is to be un derstood that in and by the claims following the description herein I intend to cover my invention in whatever form it may be embodied.

Referring to the drawings:

Figure 1 is a side elevation of my invention.

Fig. 2 is a plan thereof.

Fig. 3 is a front end elevation.

Fig. 1 is a view illustrating the means for adjusting the revolving table.

Fig. 5 is a cross sectional view of my invention taken on line 55 of Fig. 2.

Fig. 6 is an end view of the selective ratchet engaging means.

Fig. 7 is a side View of the ratchet engaging means.

In the drawings 1 and 2,indicate transverse base bars to which are secured the ends of guides 3 and 4 between which is slidably mounted a slide 5, the guides being provided with longitudinal tongues 6 and the slide being provided with grooves 7 in which said tongues fit to support the slide in sliding position in said guides. On the rear end of the slide 5 is mounted a frame 8. A vertical shaft 9 is journaled in bearings 10 and 11 respectively on the slide 5 and in the top of frame 8 on the upper end of which shaft is secured a rotatable table 12. A longitudinal horizontal shaft 13 is journaled in bearings 14 and 15 respectively in frame 8 and in a frame 16 mounted on the forward end of slide 5. On the rear end of shaft13 is secured a bevel gear 17 in mesh with a bevel gear 18 on the shaft 9. Forwardly of the frame 16 on shaft 13 are secured a plurality of ratchet wheels 19, 20 and 21, differing respectively in number of teeth, and on the forward end of said shaft is secured a hand Specification of Letters Patent.

Patented June 22, 1920. 1919. Sel m No. 307,582.

wheel 22 whereby the shaft is turned to rotate table 12. Rods 23 and 21 are secured to frames 8 and 16 and extend forwardly through frame 16. On the rods 23 and 24 forwardly of the frame 16 is slidably mounted a pawl frame 25 formed with a forked bearing 26, through which rods 23 extend be tween the members of which bearing a pawl 27 is slidably mounted on shaft 23 so that the frame may be moved along rods 23 and 24: to engage any of the ratchets 19, 20 or 21. A spring 28 is connected to the pawl 27 and to the frame 25 for maintaining the pawl in engagement with said ratchets. A set screw 25 is mounted in the frame 25 on engaging the rod 23 to lock the frame on said rod and the pawl 27 in engagement with the desired ratchet. A screw 29 extends longitudinally under the slide 5, through a nut 30 secured to the bottom of the slide, and is journaled in the base members 1 and 2. A hand wheel 31 is secured on the forward end of screw 29 whereby the screw is turned to move the table 12 forwardly and backwardly with relation to a punch 32 or other tool to determine the diameter of the circle to be divided. A set screw 35 is mounted in the guide 4: for engaging the slide 5 to lock the table 12 in the desired relation to punch 32.

The operation of my invention is as follows:

A tank head is placed upon the table 12 with its center coinciding with the center of the table and the head is clamped to the table by clamps, not shown. The table is adjusted with relation to the punch 32 by screw 29 and nut 30 until the punch rests directly over the circle on which the bolt holes are to be punched through the tank head. The table is thus locked by the set screw 35. Each ratchet 19, 20 and 21 is divided into a number of teeth corresponding to a number of divisions into which it is desired to divide a circle or to a number of points on the tank head at which the bolt holes are to be punched. The frame 25 is adjusted on the rods 23 and 24 until the pawl 27 engages the ratchet 19, 20 or 21 which has the number of teeth corresponding to the number of bolt holes which it is desired to punch in the tank head. The first hole is punched in the tank head by the punch 32. The shaft 13 is turned until the pawl 27 engages the next tooth on the ratchet 19, 20 or 21 according to which ratchet the pawl engages, whereby the table is turned until the punch is opposite the point at which the next hole is to be punched in the head. The next hole is then punched by the punch in the head. The table is thu intermittently turned and the holes progressively punched in the head until all the holes are punched therein. The head is .then unclamped from the table.

Having described my invention, I claim:

1. In a device for dividing circles, a table, a shaft, means to enable said shaft to rotate said table, a plurality of ratchet wheels on said shaft differing respectively in number of teeth, and a pawl for selectively engaging said ratchet wheels.

2. In a device for dividing circles, a table, a shaft, means to enable said shaft to rotate said table, a plurality of ratchet wheels on said shaft differing respectively in number of teeth, a pawl for selectively engaging said ratchet wheels, and means for shifting the position of said table.

a slide mounted in said guide, a table mounted on said slide, a shaft, means to enable said'shaft to rotate said table, a plurality of ratchet wheels on said shaft differing respectively in number of teeth, a pawl for selectively engaging said ratchet wheels,

and a screw for moving said slide.

5. In a device for dividing circles, a guide, a slide mounted in said guide, a table mounted on said slide, a shaft, means to enable said shaft torotate said table, a plurality of ratchet wheels on said shaft differing respectively in number of teeth, a pawl for selectively engaging said ratchet wheels, and means for locking said slide. I 7

6. In a device for dividing circles, a table, a shaft, means to enable said shaft to rotate said table, a plurality of ratchet wheels on said shaft differing respectively in number of teeth, rods, a sliding pawl frame mount-r ed on said rods, a pawl mounted on one of said rods and carried by said frame for selectively enabling said pawl to engage said ratchets, and mean for securing-said frame on said rod, to maintain said pawl in engagement with any of said ratchets.

In testimony whereof I affix my signature.

HA RY R. HEYMAN. 

